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Description of the menu options
ELSA MicroLink Cable
R95
IP-routing-table
The routing table can contain a maximum of 128 entries of destination network
addresses or direct IP addresses with netmasks, and the names or IP addresses of other
local routers. Alternatively, you can enter a setting by means of which packets to specific
destination IP addresses are discarded and are not answered by proxy ARP. This is done
by entering 0.0.0.0 for the name of the responsible router.
The IP routing table is generally sorted as shown below:
The longest network mask is placed on top.
For network masks of equal length, the one with the smallest IP address is placed
on top.
Address ranges that are prohibited in the Internet are excluded from transmission by
preset entries in the IP routing table (the router name 0.0.0.0 means that packets to these
addresses are not transmitted). The IP routing table below is provided by way of example
and also shows the default settings:
However, if these addresses are required for Intranet use, for example, it is possible to
delete the predefined entries at any time. If the routing table contains no entries with
the router name 0.0.0.0, the router processes all IP addresses with valid routes.
The last line is an entry for the “default route”. The IP address 255.255.255.255 means
the same as 0.0.0.0 (for technical reasons, 0.0.0.0 cannot be entered in the first column).
Because it contains the IP network mask 0.0.0.0, this line is always appropriate after the
rest of the table has been searched. The router with the name 'Cable' stands for the
cable network. The router thus sends everything that it cannot forward or transfer over
other routes to the cable network operator's headend.
To route all data packets to a specific network, e.g. via an ISDN router in your LAN to
another, enter the IP address of the other network and the netmask in the table and enter
the local IP address of the router under 'Router'. The following assumes that your local
network is using the IP addresses in the address range 10.1.0.0 (netmask 255.255.255.0).
The ISDN router has the local IP address '10.1.0.99'; the other local network (that of your
branch office) uses 10.2.0.0 (netmask 255.255.255.0). With the following entries, the
cable modem will forward all data packets for the other network to the ISDN router and
IP-address IP netmask Router-name Distance
192.168.0.0 255.255.0.0 0.0.0.0 0
172.16.0.0 255.240.0.0 0.0.0.0 0
10.0.0.0 255.0.0.0 0.0.0.0 0
255.255.255.255 0.0.0.0 Cable TV network 0